EP2193878B1 - A manually fed machine for working on materials, objects and the like, and protective means for such a machine - Google Patents
A manually fed machine for working on materials, objects and the like, and protective means for such a machine Download PDFInfo
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- EP2193878B1 EP2193878B1 EP20100157319 EP10157319A EP2193878B1 EP 2193878 B1 EP2193878 B1 EP 2193878B1 EP 20100157319 EP20100157319 EP 20100157319 EP 10157319 A EP10157319 A EP 10157319A EP 2193878 B1 EP2193878 B1 EP 2193878B1
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- European Patent Office
- Prior art keywords
- radiation
- detector
- unit
- tool
- feeding area
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- 230000001681 protective effect Effects 0.000 title claims abstract description 17
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- 238000001514 detection method Methods 0.000 claims abstract description 16
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- 238000012545 processing Methods 0.000 description 13
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
- B23Q11/0089—Safety devices protecting the operator, e.g. against accident or noise actuating operator protecting means, e.g. closing a cover element, producing an alarm signal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/0078—Safety devices protecting the operator, e.g. against accident or noise
- B23Q11/0082—Safety devices protecting the operator, e.g. against accident or noise by determining whether the operator is in a dangerous position
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
- B23Q17/24—Arrangements for observing, indicating or measuring on machine tools using optics or electromagnetic waves
- B23Q17/2433—Detection of presence or absence
- B23Q17/2438—Detection of presence or absence of an operator or a part thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S83/00—Cutting
- Y10S83/01—Safety devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/081—With randomly actuated stopping means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/081—With randomly actuated stopping means
- Y10T83/091—Responsive to work sensing means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T83/00—Cutting
- Y10T83/141—With means to monitor and control operation [e.g., self-regulating means]
- Y10T83/145—Including means to monitor product
Definitions
- US-A-2005/0066784 discloses safety methods for use in power equipment like a manually fed working machine for materials, objects or the like.
- This known methods comprise a human skin detector comprising a radiation emitting unit and a skin sensor comprising a receiving unit for receiving radiation reflected by the skin. As soon as the skin is detected, a powered tool or the like is stopped immediately.
- the invention proposes a manually fed treating and/or processing machine for materials, objects or the like, which is provided with the features of claim 1, and a protective means for protecting or warning people against access to danger zones according to claim 8.
- Individual embodiments of the invention are the subject matter of the dependent claims, respectively.
- the invention provides that a feeding area in front of the tool is contactlessly monitored for the existence of a hand therein, or generally speaking, for the presence of human skin therein.
- One of the transmitter diodes may emit in the range below 900 nm. Preferably, however, all transmitter diodes emit in the near-infrared range.
- an advantageous development of the invention provides that the transmitter diodes of two adjacent sets, transmitting at the same wavelength, overlap, i.e. these two transmitting diodes illuminate a common part of the section of the feeding area, so that in turn the reflected radiation is then intensive enough to be received by the receiver diode or the receiver diodes.
- the transmitter diodes could also be pulsed to be able to emit a short-termed increase in radiation energy without being operated above their maximum allowable power loss.
- refractive or reflective optical elements such as lenses
- a plurality of sets of radiation and receiver units are arranged side by side, the radiation units of two adjacent being arranged such that, after reflection from the area covered, the receiver unit of the respective adjacent set can detect the radiation at the same respective wavelength of the one radiation unit.
- the radiation unit may include a plurality of individual radiation sources emitting narrowband radiation at the wavelengths of interest. These radiation sources may be LED's, laser diodes, luminescence emitters, or gas discharge lamps, in particular xenon lamps.
- All diodes of the units 30 are electrically connected to a signal evaluation unit 38 in which the signals from the receiver diode 36 are evaluated and which further drives the transmitter diodes 32,34 of the detector 24.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Sawing (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Disintegrating Or Milling (AREA)
- Turning (AREA)
Abstract
Description
- The invention refers to a manually fed machine for working on materials, objects or the like. In particular, the machine refers to circular saw or band saw benches, planing benches, bench drills, presses or scissors. The invention further refers to a protective means for a working machine.
- With manually fed material working machines, an increased level of protection against injuries is required. Thus, with circular saw benches, for example, it has to be provided that the saw blade is covered and/or stopped as soon as it is detected that a hand approaches the saw blade. Heretofore, no adequate and satisfactory solutions to such problems exist in prior manually fed treating and/or processing or working machines.
- It is generally known to use infrared cameras to monitor an area to be protected against intrusion by humans. An example for such a system is described in
US-B-6,370,260 . The known system works with cameras receiving in the near-infrared spectrum, the area to be monitored being exposed to broadband radiation. The known systems are too expensive to prevail in simple machines such as manually fed treating and/or processing machines. - Thus, it is an object of the invention to provide a manually fed treating and/or processing machine for materials, objects or the like, which has a simplified and especially economic detection capability for detecting human skin and for distinguishing human skin from materials and objects to be treated, or the like.
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US-A-2005/0066784 discloses safety methods for use in power equipment like a manually fed working machine for materials, objects or the like. This known methods comprise a human skin detector comprising a radiation emitting unit and a skin sensor comprising a receiving unit for receiving radiation reflected by the skin. As soon as the skin is detected, a powered tool or the like is stopped immediately. -
US-A-2004/0167502 discloses an optical sensor and method for identifying the presence of skin. In one configuration the known sensor uses multiple light emitting diodes, each of a unique wavelength band, and a broad-band photodetector to measure the remission of light at multiple wavelengths from a material being analyzed. Characteristics of the spectral remission of the material are used to discriminate human skin from materials that are not human skin. - To achieve this object, the invention proposes a manually fed treating and/or processing machine for materials, objects or the like, which is provided with the features of claim 1, and a protective means for protecting or warning people against access to danger zones according to claim 8. Individual embodiments of the invention are the subject matter of the dependent claims, respectively.
- In a manually fed treating and/or processing machine, the invention provides that a feeding area in front of the tool is contactlessly monitored for the existence of a hand therein, or generally speaking, for the presence of human skin therein.
- In the following, the invention will be described with reference to embodiments relating to the inverse concept of the invention with regard to the emission and receipt of radiation of at least two wavelengths. Thus, the invention relates to the inversion of the principles described now. According to an embodiment not covered by the claims, this is effected by means of a detector comprising a set of at least three semiconductor diodes. At least two of these semiconductor diodes are transmitter diodes, whereas at least one of the semiconductor diodes is configured as a receiver diode. The transmitter diodes emit narrowband radiation with at least two different transmission wavelengths in the wavelength range between 900 nm and 1500 nm towards a section or partial area of the feeding area. The at least one receiver diode receives the radiation from the transmitter diodes reflected, i.e. re-emitted, from the section of the feeding area. This is suitably effected successively, i.e. the transmitter diodes are driven successively, so that the signal received from the receiver diode can be associated to the reflected radiation of each of the respective transmitter diodes.
- The receiver diode supplies a signal representing the intensity of the reflected radiation.
- In a signal evaluation unit, the received signals from the receiver diode or the receiver diodes are evaluated, wherein, according to the invention, a relation is established in the signal evaluation unit between the intensities of the reflected radiations from the transmitter diodes (e.g. calculating quotients or differences). These (remission) intensities have different values, depending on whether the radiation is reflected by human skin or by the materials or objects to be processed. It is thus possible to reliably determine whether human skin, i.e. a human hand or a part of a human hand, is present in the feeding area or in the section contactlessly covered by the detector. A protective means may then be used to deactivate the tool so as to provide protection against potential injuries caused by the tool.
- The contactless detector provided by the invention operates at least at a wavelength in the near-infrared range, i.e. in the range from 900 nm to 1500 nm. Studies on human skin have shown that this wavelength range is very well suited to detect hands of different complexions and under different illumination conditions and to thereby reliably distinguish it from materials such as wood, plastic material and metal. Moreover, a detector operating in the above described wavelength range is hardly exposed to electric or thermal influences, influences of humidity or variations in the illumination condition. Further, the dependence on the hue of the skin is negligible.
- One of the transmitter diodes may emit in the range below 900 nm. Preferably, however, all transmitter diodes emit in the near-infrared range.
- In the wavelength range selected according to the invention, the remission spectrum of human skin differs clearly from the remission spectrum of materials to be worked upon with a treating and/or processing machine, such as different kinds of wood, plastic materials and metals, so that an analysis (e.g. calculation of quotients and differences) of the remission intensities at at least two points of the wavelength range will yield an unambiguous distinction between human skin and material to be treated or processed.
- Thus, according to an embodiment not covered by the invention, preferably narrowband (e.g. 50 nm to 200 nm at most) radiation is transmitted at at least two different transmission wavelengths, the radiation being received by a broadband receiver diode or receiver diodes after it has been reflected in the feeding area. Diverse semiconductor diodes (light emitting diodes or laser diodes) are commercially available at low cost, which emit narrowband radiation within the wavelength range of interest. Thus, the realization of the detector can rely on already commercially available economic components, whereby the prime costs of the detector provided by the invention are reduced.
- The signals from the detector can also be evaluated as fast as possible, since no camera pictures, as used in known systems, have to be evaluated. Rather, merely the integrals over the intensity of the radiation reflected form a section of the feeding area are evaluated. These signals are supplied by the receiver diode, whereby these signals are immediately and quickly available and can thus also be evaluated immediately.
- It is further possible to train the detector to still supply a result representing human skin, when evaluation results are obtained that only slightly deviate from the evaluation result for the detection of human skin. This is desirable, for example, if a hand to be detected is covered by a latex glove. Depending on the transmission behaviour of the glove material, skin may still be detected therethrough.
- It is feasible to arrange a plurality of semiconductor diode sets, each formed by at least two transmitter diodes and at least one common receiver diode, along a row or line or several successive rows or lines in the feeding area, so that a (border) line or a (border) strip (e.g. about or in the feeding area) can be scanned. Thus, it is achieved that a hand approximating a tool can reliably be detected from a plurality of directions.
- The wavelengths in the near-infrared wavelength range proposed by the invention, which are to be selected for use in the detection, are suitably detected such that the remission intensities in case of a reflection from human skin differ as clearly as possible from the remission intensities in case of materials to be treated or processed. Transmitter diodes transmitting (in a narrow band) at these preferred wavelengths exist as mentioned above and are usually available at low cost. Preferably, a detector is used which comprises transmitter semiconductor diodes and a receiver semiconductor diode, the wavelengths of the transmitter diodes preferably being at 950 nm and 1450 nm, 950 nm and 1050 nm, 950 nm and 1200 nm, 1050 nm and 1200 nm, 1050 nm and 1300 nm, 1050 nm and 1450 nm, or 1200 nm and 1450 nm.
- It is a certain drawback of the use of commercial semiconductor transmitter diodes that they emit only with a relatively low intensity. In consideration of the ambient light and the ambient influences, it might happen that the radiation received by the receiver diode is too weak to obtain sufficiently reliable results. Therefore, an advantageous development of the invention provides that the transmitter diodes of two adjacent sets, transmitting at the same wavelength, overlap, i.e. these two transmitting diodes illuminate a common part of the section of the feeding area, so that in turn the reflected radiation is then intensive enough to be received by the receiver diode or the receiver diodes. Alternatively or In addition, the transmitter diodes could also be pulsed to be able to emit a short-termed increase in radiation energy without being operated above their maximum allowable power loss. Optionally, It is also possible to arrange refractive or reflective optical elements, such as lenses, in front of the transmitter or receiver diodes to enhance the signal.
- In an advantageous development of the invention, it is further provided that the ambient light received by the receiver diode or the receiver diodes can be compensated in the signal evaluation unit, so that the pure useful signal remaining is the light from the transmitter diodes reflected from the section of the feeding area.
- It is further advantageous for the narrowband transmitter diodes to have a spectral bandwidth of up to 200 nm at most, the spectral bandwidth being defined as the range within which the transmitter diode emits with at least 50% of the maximum intensity.
- Preferably, the protective means is provided with a cover element adapted to be introduced between the section of the feeding area covered by the detector and the tool, a displacement unit for removing the tool from the feeding area, a braking unit for braking the tool and/or an alarm generation unit for generating an (optical or acoustic) alarm signal.
- An alternative of the invention regards a case inverse to the afore mentioned alternative, wherein the tool is only activated and/or released, if the detector detects a material to be treated and/or processed.
- Here, it should be noted in particular that there are no restrictions to a realization of a detector having a plurality of transmitter diodes. Generally speaking, the detector comprises a transmitter unit and a receiver unit, the transmitter unit emitting at at least two different wavelengths in the range from 900 nm to 1500 nm. Thus, depending on the position of the wavelengths, it is possible, for example, to emit these wavelengths from a single semiconductor diode, for example. It is also conceivable to form the narrowband detection radiation by filtering the radiation of a broadband radiation source. The above and the following statements on the detector should be understood such that the same is not limited to the number of transmitter diodes. Rather, a single transmitting source can be used that emits narrowband radiation at one or a plurality of wavelengths. The invention according to the claims relates to the inversion of the active principle of the invention described above; i.e., according to the invention the radiation is generated as broadband radiation, whereas the reflected radiation is received by at least two, in particular narrowband receivers at the wavelengths indicated above with respect to the transmitter diodes.
- LED's, laser diodes, luminescence emitters, or gas discharge lamps are useful as the radiation unit. The receiver unit may be formed by photodiodes, photocells, photomultipliers, CDS elements, or phototransistors.
- It should further be noted here that forming a relation namely quotient or difference among the received radiation intensities at the different wavelengths refers in particular to the calculation of differences or quotients for the respective values of intensity or to a comparison between these values. The way in which the measured intensity values of the reflected radiations are related is primarily dependent on the application. For the detection of human skin as a protective measure used with a treating and/or processing machine for materials, objects and the like, it has proven suitable to form the quotient from the at least two remission intensity values, it being basically unimportant, which intensity values are used as the divisor and which are used as the dividend.
- The invention in its most general form refers to the use of radiation or transmitter units and receiver units in manually fed treating and/or processing machines or in protective means for such treating and/or processing machines. Thus, the invention proposes a manually fed treating and/or processing machine for materials, objects and the like, in particular circular saw or band saw benches, planing benches, bench drills, presses or scissors, comprising:
- a working tool,
- a feeding area in front of the tool, within which a person's hand is present when feeding material to be worked on to the tool,
- a detector covering at least a section of the feeding area for a contactless detection of human skin,
- the detector comprising at least one set of at least one radiation unit and at least one receiver unit,
- the at least one radiation unit emitting narrowband radiation towards said section of the feeding area, said radiation being emitted with at least two different wavelengths in the wavelength range between 900 nm and 1500 nm, whereas the at least one receiver unit receives the radiation reflected from the section of the feeding area,
- a signal evaluation unit connected with the detector for evaluating the intensity of the reflected radiation from the radiation unit received by the receiver unit,
- the signal evaluation unit determining quotients or differences from the intensities of the reflected radiation from the radiation unit, whether the detector detects human skin, and wherein
- upon the detection of human skin, a protective means may be activated for protection against potential injuries caused by the tool.
- It is essential to the invention in its general form that the intensities of the remissions are detected and analyzed selectively for at least two of the wavelengths mentioned above, since these remission intensities allow for a reliable analysis for living human skin or skin that is not vital or metabolically active, respectively. Here, it is possible for the transmitter unit emits broadband radiation and the receiver unit receives in a narrow band at the at least two wavelengths, or both the transmitter unit and the receiver unit are of broad-band design, however, the required selection for the at least two wavelengths or wavelength ranges being performed by wavelength-selective filtering.
- Advantageously, one of the wavelengths of the radiation unit is below 900 nm. In particular, the wavelengths of the radiation unit are at 950 nm and 1450 nm, 950 nm and 1050 nm, 950 nm and 1200 nm, 1050 nm and 1200 nm, 1050 nm and 1300 nm, 1050 nm and 1450 nm, or 1200 nm and 1450 nm.
- In an advantageous embodiment of the invention, it is further provided that a plurality of sets of radiation and receiver units are arranged side by side, the radiation units of two adjacent being arranged such that, after reflection from the area covered, the receiver unit of the respective adjacent set can detect the radiation at the same respective wavelength of the one radiation unit.
- Further, it is suitable for the radiation unit and/or the receiver unit to emit radiation with a spectral bandwidth of up to 200 nm, preferably below 50 nm.
- The radiation unit may include a plurality of individual radiation sources emitting narrowband radiation at the wavelengths of interest. These radiation sources may be LED's, laser diodes, luminescence emitters, or gas discharge lamps, in particular xenon lamps.
- However, it is also possible for the radiation unit to comprise only one radiation source emitting narrowband radiation, especially as a line spectrum, at different wavelengths. Suitably, such a radiation source is a luminescence element emitting a line spectrum of a combination of the necessary at least two different wavelengths.
- A suitable receiver unit may be a photodiode, a phototransistor, a photomultiplier, or a CDS element.
- Suitably, the wavelength selection may also be realized by means of a filter unit arranged between the transmitter unit and the area covered and/or between the area covered and the receiver unit.
- Suitably, at least one refractive or reflective optical element is arranged in the beam path between the radiation unit and the receiver unit.
- An alternative manually fed treating and/or processing machine for materials, objects and the like, in particular circular saw or band saw benches, planing benches, bench drills, presses or scissors, comprises:
- a working tool,
- a feeding area in front of the tool, within which a person's hand is present when feeding material to be worked on to the tool,
- a detector covering at least a section of the feeding area for a contactless detection of material, objects, or the like, to be treated and/or processed,
- the detector comprising at least one set of at least one radiation unit and at least one receiver unit,
- the at least one radiation unit emitting narrowband radiation towards said section of the feeding area, said radiation being emitted with at least two different wavelengths in the wavelength range between 900 nm and 1500 nm, whereas the at least one receiver unit receives the radiation reflected from the section of the feeding area,
- a signal evaluation unit connected with the detector for evaluating the intensity of the reflected radiation from the radiation unit received by the receiver unit,
- the signal evaluation unit determining from quotients or differences the intensities of the reflected radiation from the radiation unit, whether the detector detects material, objects, or the like, to be treated and/or processed, and wherein
- the tool can be activated only if the detector detects material, objects, or the like, to be treated and/or processed.
- Finally, an alternative protective means for protecting or warning people against access to danger zones comprises:
- a detector for a contactless detection of human skin within the area covered by the detector,
- the detector comprising at least one set of at least two transmitter diodes and at least one receiver unit,
- the at least one radiation unit emitting narrowband radiation towards said area covered by the detector, said radiation being emitted at at least two different wavelengths in the wavelength range between 900 nm and 1500 nm, whereas the at least one receiver unit receives the radiation reflected from the section of the reception area,
- a signal evaluation unit connected with the detector for evaluating the intensity of the reflected radiation from the radiation unit received by the receiver unit,
- the signal evaluation unit being adapted to determine from the intensities of the reflected radiation of the radiation unit, whether the detector detects human skin.
- This protective means comprises a detector as described above with respect to the description of the processing machine. The protective means of the invention thus includes all above-mentioned variants of the contactless detector.
- The invention will be described in more detail with reference to the drawings. In the figures:
- Fig. 1
- is a side view of a circular saw bench featuring the detection of human skin,
- Fig. 2
- is a top plan view on the circular saw bench of
Fig. 1 , - Fig. 3
- is a schematic illustration of the emission and reception cones of the transmitter and receiver diodes of two adjacent sets of the detector, and
- Fig. 4
- is a top plan view on the bottom face of a detector set.
-
Fig. 1 is a side view illustrating acircular saw bench 10 as an example of a manually fed treating and/or processing machine, wherein, according to the invention, the existence of human skin, i.e. the presence of a hand, in a predetermined area can be detected. Thecircular saw 10 comprises abench 12 and arotating saw blade 14 above which aprotective hood 16 is situated, as is known per se. Material to be processed, e.g. wood, is pushed manually (see the arrow 20) through afeeding area 18 on thebench 12 of thecircular saw 10, the area being located in front of thesaw blade 14. Within thisfeeding area 18, asection 22 exists that is contactlessly and optically covered by means of adetector 24. Within thissection 22, it is checked by means of thedetector 24, whether human skin, i.e. a human hand, is detected. If this is the case, thecircular saw 10 is deactivated by lowering acover element 26, which is a part of aprotective means 28, from above thesaw blade 14 down to thebench 12, thereby covering the area in front of thesaw blade 14 from a detected hand. As a further measure, thesaw blade 14 can be braked to a standstill. - As is obvious especially from
Fig. 2 , thedetector 24 comprises a plurality ofunits 30 located about thefeeding area 18 in front of thesaw blade 14 and substantially laterally of the saw blade, wherein further units 30 (not illustrated inFig. 2 ) may be arranged around thesaw blade 14 that also cover the lateral rear area and the rear area around the saw blade. As can be seen fromFigs. 3 and 4 , in this embodiment eachunit 30 includes three semiconductor diodes, namely twotransmitter diodes receiver diode 36. The transmitter diodes are either laser or light emitting diodes. These light emitting diodes emit narrowband radiation at different wavelengths in the near-infrared range between 900 and 1500 nm. Thereceiver diode 36 has a broad-band configuration. - All diodes of the
units 30 are electrically connected to asignal evaluation unit 38 in which the signals from thereceiver diode 36 are evaluated and which further drives thetransmitter diodes detector 24. - In this embodiment, the
transmitter diode 32 transmits narrowband radiation, i.e. in a range of 200 nm at most, about a wavelength of 950 nm, whereas thesecond transmitter diode 34 also transmits narrowband radiation at another wavelength of 1450 nm. The radiation emitted by allunits 30 of thedetector 24 impinges on thebench 12 in thesection 22 of thefeeding area 18, from where reflected radiation is received by the receivingdiodes 36. Should a hand be present in thissection 22, a characteristic intensity of the remission at the two transmission wavelengths is obtained. Thereceiver diodes 36 sense the intensity of the reflected radiation, a quotient of the intensity values being calculated in thesignal evaluation unit 38. This quotient differs clearly from a remission quotient obtained by the intensity values of the remissions when the transmission radiation is reflected from material, such as wood, to be processed by thecircular saw 10. Thus, a distinction between human skin or a human hand and the material to be processed can be made. - Thereby, two possibilities are obtained for the safety control of the
circular saw 10. Either, the circular saw is automatically turned off when the detector detects a human hand, or thecircular saw 10 is activated only when thedetector 24 detects material to be processed. - Referring to
Fig. 3 , a particularity of the arrangement ofadjacent units 30 of thedetector 24 will be described shortly. Theemission cones 40 of the twotransmitter diodes 32 of twoadjacent detector units 30, which diodes transmit at the same wavelength, overlap on thebench 12 in the area 42 (seeFig. 3 ), so that in this area covered by the receiver diodes 36 (see their detection cones 44) a higher radiation intensity prevails, even if each individual of the twotransmitter diodes 32 only has a low radiation intensity. - The invention according to the claims relates to the inversion of the active principle of the invention described before; i.e., according to the invention the radiation is generated as broadband radiation, whereas the reflected radiation is received by at least two, in particular narrowband receivers at the wavelengths indicated above with respect to the transmitter diodes.
Claims (7)
- A manually fed working machine for materials, objects and the like, in particular circular saw or band saw benches, planing benches, bench drills, presses or scissors, comprising:- a working tool (14),- a feeding area (18) in front of the tool (14), within which a person's hand is present when feeding material to be worked on to the tool (14),- a detector (24) covering at least a section (22) of the feeding area (18) for a contactless detection of human skin,- the detector (24) comprising at least one radiation unit (32,34) and at least one receiver unit (36),- the at least one radiation unit (32,34) emitting radiation towards said section (22) of the feeding area (18), and the at least one receiver unit (36) receives the radiation reflected from the section of the feeding area (18) at at least two different wavelengths in the wavelength range between 900 nm and 1500 nm, and- a signal evaluation unit (38) connected with the detector (24) calculating the quotients or differences of the intensities of the reflected radiations received by the receiver unit (36) at the at least two wavelengths emitted from the radiation unit (32,34), wherein based on the calculation- the signal evaluation unit (38) determines whether the detector (24) detects human skin, and wherein upon the detection of human skin, a protective means (28) may be activated for protection against potential injuries caused by the tool (14),
or- the signal evaluation unit (38) determines whether the detector (24) detects material, objects, or the like, to be worked on, and wherein the tool (14) can be activated only if the detector (24) detects material, objects, or the like, to be worked on. - The manually fed working machine of claim 1, wherein the wavelengths received by the receiver unit (36) are at 950 nm and 1450 nm, 950 nm and 1050 nm, 950 nm and 1200 nm, 1050 nm and 1200 nm, 1050 nm and 1300 nm, 1050 nm and 1450 nm, or 1200 nm and 1450 nm.
- The manually fed working machine of claim 1 or 2, wherein a plurality of respective sets of radiation and receiver units (32,34,36) are arranged side by side, the radiation units (32,34) of two adjacent sets being arranged such that, after reflection from the section (22) of the feeding area (18), the respective radiation at the same wavelength can be detected by the receiver unit (36) of the respective adjacent set.
- The manually fed working machine of one of claims 1 to 3, wherein ambient light received by the receiver unit (36) can be compensated in the signal evaluation unit (38).
- The manually fed working machine of one of claims 1 to 4, wherein the protective means (28) comprises a cover element (26) movable in between the section (22) of the feeding area (18) covered by the detector (24) and the tool (14), a displacement unit for removing the tool (14) from the feeding area (18), a braking unit for braking the tool (14) and/or an alarm generation unit for generating an (for example, optical or acoustic) alarm signal.
- The manually fed working machine of one of claims 1 to 5, wherein the receiver unit (36) receives at a spectral bandwidth of up to 200. nm, preferably below 50 nm.
- A protective means for protecting or warning people against access to danger zones comprising:- a detector (24) for a contactless detection of human skin within the area (22) covered by the detector (24),- the detector (24) comprising at least one radiation unit (32,34) and at least one receiver unit (36),- the at least one radiation unit (32,34) emitting radiation towards said section (22) of the feeding area (18), and the at least one receiver unit (36) receives the radiation reflected from the area (22) covered by the detector (24) at at least two different wavelengths in the wavelength range between 900 nm and 1500 nm, and- a signal evaluation unit (38) connected with the detector (24) for calculating the quotients or differences of the intensity of the reflected radiation received by the receiver unit (36) at the at least two different wavelengths emitted from the radiation unit (32,34),- wherein based on the calculation the signal evaluation unit (38) being adapted to determine whether the detector (24) detects human skin.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006059793 | 2006-12-15 | ||
EP20070857714 EP2054193B1 (en) | 2006-12-15 | 2007-12-17 | A manually fed machine for working on materials, objects and the like, and protective means for such a machine |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP07857714.5 Division | 2007-12-17 |
Publications (2)
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EP2193878A1 EP2193878A1 (en) | 2010-06-09 |
EP2193878B1 true EP2193878B1 (en) | 2011-08-03 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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EP20070857714 Not-in-force EP2054193B1 (en) | 2006-12-15 | 2007-12-17 | A manually fed machine for working on materials, objects and the like, and protective means for such a machine |
EP20100157319 Not-in-force EP2193878B1 (en) | 2006-12-15 | 2007-12-17 | A manually fed machine for working on materials, objects and the like, and protective means for such a machine |
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EP20070857714 Not-in-force EP2054193B1 (en) | 2006-12-15 | 2007-12-17 | A manually fed machine for working on materials, objects and the like, and protective means for such a machine |
Country Status (5)
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US (2) | US8171831B2 (en) |
EP (2) | EP2054193B1 (en) |
AT (2) | ATE461782T1 (en) |
DE (1) | DE602007005490D1 (en) |
WO (1) | WO2008071805A1 (en) |
Families Citing this family (18)
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DE102006048560A1 (en) * | 2006-10-13 | 2008-04-17 | Robert Bosch Gmbh | guard |
GB2452085B (en) * | 2007-08-24 | 2011-09-28 | John Douglas Woodward | Guard apparatus for mechanical saw blade |
US8336434B2 (en) * | 2007-10-22 | 2012-12-25 | Formax, Inc. | Food article end detection system for a food article slicing machine |
DE102007062996A1 (en) * | 2007-12-21 | 2009-06-25 | Robert Bosch Gmbh | Machine tool device |
DE102008054696A1 (en) * | 2008-12-16 | 2010-06-17 | Robert Bosch Gmbh | machine tool |
DE202009007035U1 (en) * | 2009-05-15 | 2010-10-14 | Homag Holzbearbeitungssysteme Ag | Processing machine with security scanner |
DE102009045322A1 (en) | 2009-10-05 | 2011-04-07 | Robert Bosch Gmbh | tooling |
DE202010004458U1 (en) * | 2010-03-24 | 2011-08-11 | Wilhelm Altendorf Gmbh & Co Kg | Safety device to prevent accidents at work on sawing machines, in particular circular saws, as well as circular saw |
AT512238A1 (en) | 2011-11-16 | 2013-06-15 | Pantec Biosolutions Ag | SKIN CONTACT DETECTION DEVICE |
CN105829018B (en) * | 2013-12-18 | 2019-09-10 | 罗伯特·博世有限公司 | It is sensed using the skin of spectrum analysis |
NZ748481A (en) * | 2016-05-12 | 2019-10-25 | Kando Innovation Ltd | Enhanced safety attachment for cutting machine |
DE202017103019U1 (en) * | 2017-05-18 | 2018-08-21 | Wilhelm Altendorf Gmbh & Co. Kg | Safety device for a sliding table saw |
DE202019102935U1 (en) * | 2019-05-24 | 2020-08-25 | Altendorf Gmbh | Safety device for machine tools |
CN110539207B (en) * | 2019-07-01 | 2020-06-12 | 乐清市双狮机械设备有限公司 | Drilling machine |
CN110480406B (en) * | 2019-08-02 | 2021-06-04 | 广东兴奇新材料有限公司 | Safe and reliable aluminum product cutting machine with prevent function that splashes |
DE202021100243U1 (en) | 2021-01-19 | 2022-04-20 | Altendorf Gmbh | Format circular saw with safety device to avoid cut injuries |
US20220266363A1 (en) * | 2021-02-25 | 2022-08-25 | Nan John Electrical Co., Ltd. | Human-body-defined security recognition system of processing machine |
DE202022101212U1 (en) | 2022-03-04 | 2023-06-07 | Altendorf Gmbh | Safety device for a machine tool |
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GB9515648D0 (en) * | 1995-07-31 | 1995-09-27 | Johnson & Johnson Medical | Apparatus for non-invasive measurement within a human or animal body |
US20040122492A1 (en) * | 1999-07-07 | 2004-06-24 | Yoram Harth | Phototherapeutic treatment of skin conditions |
US6370260B1 (en) | 1999-09-03 | 2002-04-09 | Honeywell International Inc. | Near-IR human detector |
US8061245B2 (en) * | 2000-09-29 | 2011-11-22 | Sd3, Llc | Safety methods for use in power equipment |
JP2001149349A (en) * | 1999-11-26 | 2001-06-05 | Nippon Koden Corp | Sensor for living body |
US7413567B2 (en) * | 2003-02-25 | 2008-08-19 | Spectragenics, Inc. | Optical sensor and method for identifying the presence of skin |
US20060101960A1 (en) * | 2003-03-10 | 2006-05-18 | Smith Matthew A | Optical proximity device for power tools |
US7068905B2 (en) * | 2003-03-12 | 2006-06-27 | Daryoosh Vakhshoori | Extended optical bandwidth semiconductor source |
US7290474B2 (en) * | 2003-04-29 | 2007-11-06 | Black & Decker Inc. | System for rapidly stopping a spinning table saw blade |
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2007
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- 2007-12-17 AT AT07857714T patent/ATE461782T1/en active
- 2007-12-17 DE DE200760005490 patent/DE602007005490D1/en active Active
- 2007-12-17 AT AT10157319T patent/ATE518619T1/en active
- 2007-12-17 EP EP20070857714 patent/EP2054193B1/en not_active Not-in-force
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- 2007-12-17 US US12/161,575 patent/US8171831B2/en not_active Expired - Fee Related
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2012
- 2012-04-23 US US13/452,975 patent/US8539868B2/en not_active Expired - Fee Related
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US20120204690A1 (en) | 2012-08-16 |
US8171831B2 (en) | 2012-05-08 |
WO2008071805A1 (en) | 2008-06-19 |
EP2054193A1 (en) | 2009-05-06 |
EP2054193B1 (en) | 2010-03-24 |
EP2193878A1 (en) | 2010-06-09 |
ATE518619T1 (en) | 2011-08-15 |
DE602007005490D1 (en) | 2010-05-06 |
US8539868B2 (en) | 2013-09-24 |
ATE461782T1 (en) | 2010-04-15 |
US20090301275A1 (en) | 2009-12-10 |
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